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thingspeak_room_temp_loop.py

By: a guest on Apr 14th, 2014  |  syntax: Python  |  size: 1.21 KB  |  views: 36  |  expires: Never
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  1. #!/usr/bin/python
  2. import httplib, urllib
  3. import os
  4. import glob
  5. import time
  6.  
  7. def doit():
  8.         base_dir = '/sys/bus/w1/devices/'
  9.         device_folder = glob.glob(base_dir + '28*')
  10.         device_file = device_folder + '/w1_slave'
  11.         temp_c, temp_f = read_temp()
  12.         Params = urllib.urlencode({'field1': temp_c, 'key':'my key'})
  13.         Headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
  14.         conn = httplib.HTTPConnection("api.thingspeak.com:80")
  15.         try:
  16.                 conn.request("POST", "/update", params, headers)
  17.                 response = conn.getresponse()
  18.                 print temp_c
  19.                 data = response.read()
  20.                 temp_c = read_temp()
  21.                 conn.close()
  22.         except:
  23.                 print "connection failed"
  24.  
  25. def read_temp_raw():
  26.         f = open(device_file, 'r')
  27.         lines = f.readlines()
  28.         f.close()
  29.         return lines
  30.  
  31. def read_temp():
  32.         lines = read_temp_raw()
  33.         while lines[0].strip()[-3:] != 'YES':
  34.                 time.sleep(0.2)
  35.                 lines = read_temp_raw()
  36.                 equals_pos = lines[1].find('t=')
  37.         if equals_pos != -1:
  38.                 temp_string = lines[1][equals_pos+2:]
  39.                 temp_c = float(temp_string) / 1000.0
  40.                 temp_f = temp_c * 9.0 / 5.0 + 32.0
  41.                 return temp_c, temp_f
  42.  
  43. #sleep for 16 seconds (api limit of 15 secs)
  44. if __name__ == "__main__":
  45.         temp_c = 0
  46.         while True:
  47.                 doit()
  48.                 time.sleep(16)
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